Sound-amplifying transmitter



Sept. 3, ,1929- 1 STEINBERGER S12-UND AMPLLFYING TRANSMITTER Filedl De@ 2.4, 1924 Patented Sept. 3, 1929,. L f

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK. v

sotiNn-AMPLIFYING TRANSMITTER.

Application led December 24, 1924. Serial 110.1752863.

This invention relates to sound conveying transmitting and amplifying structures, commonly known as loudspeakers, specially applicable to radio equipment, talking machines, telephones, megaphones, speaking tubes, acoustic and musical instrumen-ts.

The object of the invention is to provide a' means for amplifying and transmitting sound waves without distortion, and thus re? tain all the original beauty of musical and other tones and the naturalqualities of the human voice.

Referring to the drawings forming apart of'this specification Fig. 1 is a front view of the device embodying my invention,

Fig. 2 is a section on line 2-2 of Fig. l, Fig. 3 is a plan of the sound conveying device used in one form of my invention, Fig. 4 is a vertical section on line 4 4 o f Fig. 3, and i Fig. l5 is a section similar to Fig-2 of a modified form of the invention.

' Fi 6 is a section on line 6 6 of Fig. 1.

In' Yfie drawings is the body of the device preferably formed from moldable material, molded into the shape shown. B is the neck portion through which' the sounds are 'conveyed direct to the sound reflecting surface l 20. C is the base and U the sound unit of usual construction.' f

In carrying outmy invention, I provide a passageway 10 in the neck portion B of the deviceA for -the sound waves which is of tapering form and of funnel shape, circular in horizontal cross section only at the point of vattachment to the transmitting unit U, the cross section above this point having a greater dimension .on one aXis or in one direction than on the other'. lThe upper portion of the passageway is provi-ded with diverging walls, the side walls 12 and 13 being fiat and the end walls 14 and 15 curved or rounded'. The

entire shape of this passageway may be described as a curve of unequal dimensions in horizontal cross section. An inclined fiat refiecting surface 2O is provided Idirectly above this passageway which surface receives directly the sound vwaves as they emanate from the transmitting unit U through the amplifying sound conveying passageway 10 and directly transmits all the sound waves into space without distortion. The inclined fiat soundreflecting surface 2O should at its base portion have the same width as the width of the upper end of the tapering soundampli'fying passageway and thev widthof the upper portion of the inclined sound reflecting surface is preferably greater than that of the lower -portion therof.

By means yof this construction sound waves are transmitted with full volume of clear and undistorted tones.

'The side walls 21 and 22 andthe bottom i vwall 23 adjacent the back sound reflecting Asurface 20 of the amplifier are each substantially flat, the side walls diverging outwardly from the flat back reflecting surface 20 and the bottom wall 'from the front of the passageway 10, as clearly shown in the drawing.

It is desirable to form the sound conveying passageway by utilizing a metallic funnel F, which is molded into the sound amplifier, as shown, (Figs. 1 and 2) t-he upper edge at 80 engaging a lip 31 formed in the wall of the amplifier A in order toholdmthe funnelA F securely in place. The circular end 'of lthe funnel is screwthreaded'at 32 so that a'screwthreaded connection ma i be formed at 33 with the unit U, and a space is formed in the bots tom of the amplifier A for the reception of the unit, a plate being secured to the base C iny 'i any suitable way to form the lowergwall of said spacefS.

The uti ization of the vfunnel shaped deviceV trated in Figs. 3 and 4. In this modified construction, however, it isdesirable to mold at the lower end ofthe device a ferrule 40 circular in horizontal cross section and screw-threaded at 41, so as to receive co-acting screwvI fatent is:

lOb'

1Q In a device of the kindv described, a sound conducting structure provided with an in-` clined Hat sound reflecting surface, the said .surface being connected directly with an enclosed sound conveying passageway having tapering sldes, two opposing sides being flat and the opposing'ends rounded.

2. In a device of the kind described, a metallic funnel shaped element forming walls of a sound conveyor, the horizontal cross section of saidelement having a greater dimension in one direct-ionv than in the other and the walls o f the said funnel shaped element being provided with a base rounded in cross section, a Haring portion having flat sides and rounded ends, the surfaces of the sides and ends merging into each other.

3. In a device of the kind described, an inclined sound amplifying surface connected with a sound conveying passageway having tapering sides, the horizontal cross .section of said passageway having a greater dimension in one axis than on' the other.

4. In a device ofthe kind described, an inclinedv sound amplifying and reflecting surface connected witha sound conveying passageway, having, tapering sides, two of the opposing sides thereof being substantially flat.

' 5. In a deviceof the kind described, a sound conveying structure provided with'an inclined flat sound'reiiecting surface, the upper portion'of said reflecting surface being of greater width than the lower portion, the

clined lflat sound reflecting surface, said sur! face belng connected with a single enclosed.

sound conveying passageway of tapering form the' dimension of the horizontal cross section of-said passageway being greater in one direction than in the other.

LOUIS STEIN BERGER. 

